Vitamin B12 deficiency or cyanocobalamin is a common condition in the elderly. It is repeatedly overlooked due to multiple
clinical manifestations that can affect the blood, neurological, gastrointestinal, and cardiovascular systems, skin and mucous
membranes. The various presentations of vitamin B12 deficiency are related to the development of geriatric syndromes like
frailty, falls, cognitive impairment, and geriatric nutritional syndromes like protein-energy malnutrition and failure to thrive,
in addition to enhancing aging anorexia and cachexia. Therefore, interventions must be developed to include their screening
and diagnosis to make early and appropriate treatment to prevent its complications before they become irreversible.